Fluid brake



March 26, :1940. w.,fH. JACOB v JELUID'BRAKE` Filed sein; 11, 1958 2 sheets-sheet 1 March 1 940. w. H. JAccB l 2,195,214

FLUID BRAKE F-irled Sept. l, 1938 2 Sheets-Sheet 2 A 1s- 6.v I n [il/ll ."7.

N v C?" A (d I l ,fc5 y Y L1 (cz 122 52H Hf@ Uffa y,Patented Mar. 26, 1940 I UNITED STATES PATENT oFFlcE `v A 2,195.214- y n FLUID naakt;

Application September 1, 1938, Serial No. 227,997

30mm. (ci. 30s-s4) develop aleak o rbebroken. grooves 6 and-1 at the end of said body and A further object is to provide an automatic small spaced'bodies 8 and 9 at each end thereof, 5 Ashut ofi' valve for fluid brake systems which will all made in a single integral member. V control various ports shutting ofthe ow of Along one side of the cylinder B` spaced thereuid through some ports, should there be a lessfrom is a distributing chamber or bore I0 into 1 ening or break in the pressure onthat side of which the lead line II from the power cylinder thevalve. p y (not shown) of'the brake' system is introduced. lo

A still further object is'to provide a safety valve 0n the opposite side of the distributing bore I0 for large trucks, busses, etc.. which will prevent connecting it with the cylinder B there are two their losing all oi their brake system ilid should aligned spaced apart sets of three inlet ports,

u any one line be'broken or develop a leak, keeping each set of ports I2, I3 and I4, leading into one 15 them with some supply of uid for the other end of the cylinder and the ports I5, I6 and Il, l brakes. In large truck and trailer or semi-trailer leading into the other end and the ports being jobs the system may be employed on both the so spaced that the two inner ports I4 and I5 -truck and trailer, preventing many accidents lead into the chamber or cylinder B in alignthrough its use. ment with the annular grooves 6 and 1 of the 2o These objects I accomplish with the device il- 4piston A when the piston iS in .the medial 0r lustratecll in the accompanying drawings in central position for normal operation of thedewhich similar numerals and letters oi?` reference vicea'nd the two outside ports I2 and I1 lead into indicate like parts throughout the several views the, Chamber B beyond each end 0f the pSten A.4

and as described in the specication forming a. Thus uid from the master cylinder enters the 26 part or this application and pointed out in the chamber or cylinder B.- To normally hold the appended claims. I piston A centrally spaced in the cylinder B the In the drawings I have shown end of the chamber or cylinder carry coil Figure 1 is a plan 4view of the master control lsprings 20 and 2I, set in receiver and closure plugs valve for any brake system. 22 and 23. These plugs do double duty being to o Figure 2 is a longitudinal section of Figure l. close the ends of the cylinder B and act as cyl- Figure 3 is a section on line 3,-3 of Figure 2, inder heads and at the same time to hold the Figure 4 is a section on line 4-4 of Figure 2. tension springs 20 and 2| in Dlae- The Outlet Figure 5 is' a, diagrammatic section showing the from each end of the cylinder B is into the brake control valve piston moved toone control posi- Vlines D and E. These lines are screwed into disa5 tion due to break in the line leading from that charge ports 24 and 24a formed in the opposite end showing the relative position oi' the cylinder, side of the cylinder from the inlet ports, and colpiston valve ports and springswhen one of the lecting chamber bores 25 and 26 are formed in lines has developed a leak o r been broken. the casing C parallel to the cylinder B with a 40 Figure 6 'is a diagrammatic view of the control port 25a and port 26a connecting the end 0f the o valve as used in series for a control oi. all four ,two chambers with the cylinder B directly 0pwheels separately. posite to the ports I4 and I5 thus, the fluidY en- Figure 7 is a diagrammatic view of the control tering thecylinder B through these later ports' valve in series with one other to control the will travel around the annular grooves 6 and 'I iront wheels with one line from the master valve of the piston and out through the ports 25a and and the rear wheels separately from another 26a into the two bores and out to the brake lines. valve. The fluid from the other two ports I2 and I1 Figure 8 is a'diagrammatic view showing the will enter the chamber 0r cylinder B and pass master control valve in series with dual valves for out through the ports 23 and 24 into l711e lines controlling the lines on truck and trailer jobs yD and E. 'I'he lines D and E may be hooked up or like set ups where dual control valves are set to separate brake cylinders as desired with other 50 up behind the master valve and one controls the modifications being shown on Sheet 2 of the `front wheel brakes of the truck and the rear drawings and described hereinafter. As asaiety u wheel brakes of the trailer and the other controls locking means for holding the piston A in one My invention relates to fluid brakes for motor vehiclesand has for its object to provide a new and highly eiiicient means for cutting off any line in the fluid brake system, should such line the Iseparate drive wheels of the truck.

In the drawings I have shown the master control valve as a slidable piston A, mounted in a cylinder B, with a casing C. The piston A is made with a central piston body 5, annular end or the other ot the cylinder when a line has been broken or developed a leak, I provide a plugv F screwed into a threaded hole in the side oi.' the casing C medially thereof and this plug AF `carries a spring controlled plunger rod 28 in a bore 28 with the spring 38 normally pressing against the inner end of said plunger rod to hold it against the side of the piston A but, when one line breaks the force ot the spring augmented by the lack of pressure in the opposite side of the piston A, and the force of the fluid will force the piston toward the end of the cylinder which controls the discharge to the broken line and the plunger rod 28 will drop the annular grooves 6 and 1 depending on the direction of travel'of the piston, as shown in Figure 5, the plunger rod has dropped or been forced into the groove 1. This locks off the line until required, and the plug F removed sufficient distance to allow lthe piston to resume its central position.

In Figures 6, 7 and 8 I have shown diiIerent diagrammatic views showing how the master control valve may be used with other like valves to control diilerent types of systems required but I do not wish to limit myself to such 'nook ups as others may be made with equal success.

. It will be obvious that one valve may be used with the power cylinder of the brake system cony nected to the line Il and with the line connected rear wheel. This same system may be employed y for a car and trailer hook up.

In Figure 6 the master-casing C is shown, connected to a casing C2 for the front brakes and C3 for the rear brakes. The lines D and E in Figure 6 show connecting the master casing C to the other casings C2 and C8 and the lines DI -and El leading from the casing C2 are directed to the front brakes and the lines D2 and E2 lead to the rear brakes each brake cylinder being connected independently.

Figure 8 shows the casing C connected to two casings C4 and C5, and the casing CB is connected by lines Dland El to the two rear brakes .as and 21 of the trucawmie :ne um 4connected to lines DI and-El with leading to the front wheels 28 and 28 and the tol secure by Letters Patent and claim:

1. A safety device for hydraulic brakes com- 4prising a casing having a cylindrical chamber therein; a piston carried in said cylinder, said piston carrying 'annular grooves near each end thereof; a lead line from thev master cylinder -ot the brake system; spaced apart lines leading from the opposite sidelof said cylinder to carry the iluid to the brakes; spaced apart sets of ports leading from the inlet lead line to the cylinder; and`spaced apart pairs of outlet ports leading from the cylinder to the spaced apart lead lines, said ports being so arranged that ln normal operation two of said pairs of inlet ports are directed into communication with the outlet ports through said cylinder, one passing into annular grooves of the piston and into an outlet port; springs carried in each end of said cylinder to force the piston` in one direction or the other,

should the pressure in either outlet line decrease from a leaky or broken line: and a spring controlled locking plunger carried in the side wall of said cylinderto engage one of said grooves when the piston has traveled sumcient distance to permit entrance thereinto by said plunger.

2. A device as set out` in claim 1 including a multiplicity vof said cylinders and piston in series to control various fluid lead lines independently.

3. A control for hydraulic brakes comprising, an elongated piston carried inV a cylinder and held in medial position by the normal force of, the fluid in the brake system; said piston having annular grooves therearound near each end thereof; a fluid vpressure lineentering yone side of said cylinder and divided into spaced apart ports to direct the fluid beyond the ends of the piston in normal operation and through the annular grooves; means to force'said piston to either end of the cylinder upon breakage of .either of the outlet lines from the cylinder; and means to permanently lock said piston when so moved until the line has beenrepaired and the piston is manually reset.

' WILLIAM H. JACOB. 

